Machine-tool holder.



R. B. CRAIG- MACHINE TOOL HOLDER. APPLICATION FILED rmms, 1911.

1,029, 1 72. Patented June 11, 1912.

2 SHEETS-SHEET 1.

l R. B. CRAIG. MACHINE TOOL HOLDER. APPLICATION FILED r2345, 1911.

Patented Julie 11, 1912.

2 SHEETS-SHEET 2.

UYNTTED STATES PATENT OFFICE.

ROBERT B. CRAIG, OF DAYTON, OHIO.

- MACHINE-TOOL HOLDER.

To all whom it may concern Be it known that I, ROBERT B. CRAIG, acitizen of the United States, residing at 264 South Findley street, inthe city of Dayton, county of Montgomery, and State of Ohio, haveinvented certain new and useful Improvements in Machine-Tool Holders, ofwhich the following is a specification.

My invention relates to tool holders adapted to receive a plurality ofdifferent tools and to support them in such relation, on the carriage ofthe lathe or similar 'machine, as will permit of conveniently bringinginto use any one of the tools so held, and

will insure proper presentation to the work-' piece of any toolcalledinto service.

One object of the present invention is to provide an independentvertical adjustment for each one of the several tools carried by theholder.

Another feature incident to this object, consists in providing a restcommon to all the stops, and locating it so that it cooperates with eachstop only as the corresponding tool is brought to the working position.

Another object of the present invention is to have an absolutely fixedpositioning of the holder and yet to have the holder readily releasablefor its rotary movement in shifting from one tool to another.

A further feature consists in means for binding the rotary holder uponits bearing so that in addition to its being held against angularmovement, the holder will be absolutely fixed against any vibration onits mounting.

A further object is to have the device conveniently operated with aminimum expenditure of time.

The tool holder is preferably in the form of a square head havinglateral recesses providing supporting shoulders for the tools and setscrews for holding the tools in their seats with ready removability andlongitudinal adjustability. The entire tool holder is mounted on thecarriage through means of a slide, which may be in the form of a T- headengaging in an undercut groove in the slide and adapted to be locked inany posi tion of adjustment to and from the work piece by means of aneccentric shaft.

The invention will be fully understood upon reference to theaccompanying drawings, in which,

Figure 1 is a top view, and Fig. 2 a vertical section in the plane ofthe axis of the Specification of Letters Patent.

Application filed February 25, 1911.

Patented June 11, 1912.

Serial No. 610,918.

tool holder and of the setting shaft; Fig. 3 1s a view similar to Fig.1, with the rotary carrying member mainly broken away; Fig. 4 is adetail View of the mounting on the carrying member and the locking shaftfor locking the slide to the carriage; and Fig. 5 is a detail view ofthe vertical adjustment of the carrying member.

On a slide 1, adapted to rest upon a standard type of T-slot carriage,is a vertically adjustable clamping aw 2 under the control of a camshaft 3, through means of which the tool holder may be locked in anyangular position and at a distance relatively to the work. Upon thevertical cylindrical post 41 of the slide is mounted an angularly andvertically adjustable carrier 5, preferably having as many sides asthere are tools to be mounted and with lateral recesses 6, in whichtools 7 are secured by set screws 8 in position for presentation to theworkpiece. A dowel 9 is adapted to enter either of a plurality ofsocket-s 10, corresponding in number to the tools so as to lock thecarrier against angular movement after any tool is brought into workingposit-ion. To insure vertical adjustment of the carrier 5, there are asmany set screws 11 as there are tools, preferably in position to impingethe dowel 9 whenever the corresponding tool is brought to workingposition, said set screws thus exerting no influence over the verticaladjustment except when their respective tools are in use, and therebyaffording means for predetermining the height of any given tool wheneverand however often it may be returned to working position, and permittingthe use of any other tool in the interim without destroying theadjustment of the particular tool in question.

To bind the carrier 5 against vibration, a slide block 12 within thepost 1 controls a plurality of wedging keys 13, through the medium ofits annular flange 14 in such manner that whenever the block 12 is drawndown ward the keys 13, sliding in their guideways 15, wedge in betweenthe post 4. and the car rier 5 and make such parts, for the time being,as a single rigid structure. Upward movement of the block 12 withdrawsthe wedging keys 13 and leaves the carrier 5 free to be raised upon itspost and thereafter rotated. For conveniently operating the block 12, Iprovide a crank shaft 16 whose crank 17 is connected through a pitman 18with the shank 19 of the block 12, so

' carrier being arrested at different heights that as the shaft 16 isrotated, the block 12 may be raised and lowered for the purposes alreadyexplained. Shank 19 may be rotatable relatively to the block 12, asshown, for which purpose, it is fitted in the socket of the block 12 andsecured therein by a plate 20. In order that pressure imparted to thewedging keys may be equalized and properly proportioned, even though thekeys may not always move the same distance vertically and at the sametime to permit a complete throw of the crank shaft in the direction ofseating, shank 19 is vertically movable in the block 12 and has aspring19 introduced between its head and the plate 20'so that the shank 19 mayyield downwardly after the block 12 is arrested. The strength of thespring 19 determines the pressure imparted to the wedging keys 13. Toconveniently disengage the dowel 9 from a socket 10 after the bindingkeys are released, the parts are proportioned so that the first part ofthe rotation of the shaft 16 relieves the binding keys and the latterpart thereof raises the block 12 until it impinges the carrier 5 andmoves the latter upward sufliciently to disengage the dowel and socket.The shaft 16 being then just past dead center and its further rotationbeing arrested by the arm 22, impinging the stop pin 23, the block 12will be held elevated and afford a turning support for the carrier 5until the proper tool is brought to the working position, after whichthe rotation of shaft 16 is reversed to permit a new socket 10 to dropover the dowel 9, which parts can be brought to register by slightrotation of the carrier, whereas a further turning of the shaft 16 willagain seat the wedging keys 13 to bind the carrier in place. In orderthat shaft 16 may yieldingly force the carrier downward and permit ofthe without interrupting the full throw of the shaft and the completebinding movement of the binding keys, block 12 has an extension 25,which affords abutment for the upper end of the spring 26 whose lowerend rests against the carrier 5. Extension 25 is conveniently providedby threading the extension to the "block 12, which construction likewisefacilitates assembling the pressure spring between the extension and thecarrier.

It is not necessary that the tool 7 assume the positions shown in thedrawings. Ordinarily the side of the carrier opposite to the shaft 16will be presented toward the work. For attacking the exterior of thework-piece, or for making an undercut in a direction away from the lathechuck, the positions of the tools as shown in the drawing, will becorrect. If, however, it is necessary to work against a shoulder or aninner surface, in a direction toward the chuck,

so that the double throw of said shaft is slightly in excess of 180 andthe crank on the inner end of the shaft is so positioned relatively tothe'arm 22 that when said arm is arrested by either of the pins 28 or24:, the

crank will have slightly passed its upper or lower dead center and willresist either the gravitation of the rotary carrier, which is for thetime being supported on the upraised block, or the resiliency of thespring 26, which exerts an upward pull on the block when the block isdown and the carrier and wedging keys are seated.

I claim 1. A tool carrier comprising a base, a rotary tool carriermounted on said base with vertlcal movement, an interlocking meanscomprising members carried respectively by the rotary carrier and thebase and caused to interengage by relative vertical move ment, wedgingkeys adapted to firmly bind the rotary carrier and base together aftertheir rotary adjustment is determined, and

means for seating and unseating said wedging keys, imparting movement tothe rotary carrier in the direction to disengage the interlocking means,and having a resilient connection with said rotary carrier in thedirection of seating the carrier and wedging keys.

, 2. A tool holder comprising a base, a tool carrier mounted on saidbase with rotary and axial movements, wedging keys having axial movementrelatively to said parts adapted to bind them together after theirrotary and vertical adjustments have been determined, a verticallymovable block having connection with said wedging keys, whereby theymove said keys to and from binding position and a spring connectionbetween said block' and the rotary carrier.

3. A tool holder comprising a base, a tool carrier mounted on said basewith rotary and axial movements, wedging keys having axial movementrelatively to said parts adapted to bind them together after theirrotary and vertical adjustments have been determined, a verticallymovable block having connection with said wedging keys, whereby theymove said keys to and from binding position, an extension on said blockprojecting through the carrier and a spring interposed between theprotruding end of said extension and the carrier, through which theblock imparts movement to the carrier in the direction of seating.

4. A tool holder comprising a base, a rotary tool carrier mounted onsaid base and having vertical movement thereon, a lifting block adaptedto raise the rotary carrier and affording a support for the carrier whenraised, permitting its rotary movement and a yielding seating connectionbetween said block and carrier.

5. A tool holder comprising a base, a rotary tool carrier mounted onsaid base and having vertical movement thereon, a lifting block adaptedto raise the rotary carrier and affording a support for the carrier whenraised, permitting its rotary movement and a yielding seating connectionbetween said block and carrier comprising an extension from the blockprojecting through the carrier and the spring interposed between theprotruding end of the extension and the carrier.

6. A tool holder comprising a base, a rotary tool carrier mounted onsaid base and having vertical movement thereon, a lifting block adaptedto raise the rotary carrier.

and affording a support for the carrier when raised, permitting itsrotary movement and a yielding seating connection between said block andcarrier, and means for raising and lowering said block comprising ashaft having connection with the block, which moves beyond center whenat the limit of its throw in order to hold the block against returnmovement.

7. In a tool holder, the combination of a suitable base, a tool carriermounted on said base, a vertically movable block interposed between saidbase and tool carrier, wedging keys controlled by said block, a shankfitted in said block, a spring interposed be tween said shank and blockand a crank shaft having controlling connection with said shank.

8. A tool holder having a base; a rotary tool carrier mounted on saidbase, having axial movement; clamping means for rigidly holding saidtool carrier on said base after rotation to position the tool,comprising a plurality of vertically moving wedging keys engaging theadjacent faces on said base and said tool carrier, a central blockhaving a central chamber and being provided with an annular collarengaging said keys in order to raise and lower them, a post seated insaid chamber, a spring within the chamber acting to press the postupward in the chamber, a horizontal crank shaft seated in said base andhaving an external handle and link connection between said crank shaftand said post.

9. A tool holder having a base, a rotary tool carrier mounted on saidbase having axial movement, interlocking means comprising a dowel on thebase and adjusting screws and sockets in the carrier, said dowel causedto engage one at the time of said screws and sockets by relativevertical movement; clamping means for rigidly holding said tool carrieron said base after rotation to position the tool, comprising a pluralityof vertically moving wedging keys engaging the adjacent faces of saidbase and said tool carrier, a central block having a central chamber andbeing provided with an annular collar engaging said keys in order toraise and lower them, a post seated in said chamber, a spring within thechamher acting to press the post upward in the chamber, a horizontalcrank shaft seated in said base and having-an external handle and linkconnection between said crank shaft and said post.

The foregoing specification signed at Dayton Ohio this 1th day of J any,1911.

ROBERT B. CRAIG.

In presence of two witnesses: H. BRAUM,

H. M. WALSH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

